Keyboard



FIG. 1 is a perspective view of a keyboard;

FIG. 2 is a top view thereof;

FIG. 3 is a front elevational thereof;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a perspective view of another embodiment of the present invention. 

The ornamental design for a keyboard, as shown and described. 